In mathematics, a limit point of a set S in a topological space X is a point x that can be approximated by points of S in the sense that every neighbourhood of x with respect to the topology on X also contains a point of S other than x itself. Note that x does not have to be an element of S. This concept profitably generalizes the notion of a limit and is the underpinning of concepts such as closed set and topological closure. Indeed, a set is closed if and only if it contains all of its limit points, and the topological closure operation can be thought of as an operation that enriches a set by adding its limit points.
Oillet
-
A small opening or loophole, sometimes circular, used in
mediaeval fortifications.
Oillet meaning & definition 1 of Oillet.
-
In the times of [castle] warfare, these were windows that went through thick walls of the front of [the castle] where the window was wider on the inside than on the outside. A benefit to such windows is it was easy to fire an [arrow] out, but archers on the outside would have trouble firing back at you.
A word that rhymes with toilet.Oillet meaning & definition 2 of Oillet.
-
An aperture or loophole for observation, especially in a wall; = eyelet. Now (Architecture): a round opening at the end of an arrow-slit (historical).
Oillet meaning & definition 3 of Oillet.
Similar Words